Proton Integration for Brevo & MailerLite

I’ve opened both a Brevo and a MailerLite account and now need them properly linked to my Proton email address so everything talks to each other smoothly. The goal right now is straightforward connection rather than a full-blown migration, but I would also like a basic automated workflow running once the links are in place.

Here’s what I need from you:
• Authenticate and verify my Proton address inside both Brevo and MailerLite so messages send and receive without errors.
• Configure one simple automated workflow in each platform (for example: new subscriber → welcome email) to confirm everything triggers correctly.

If you’ve handled Proton setups before—especially alongside Brevo (Sendinblue) or MailerLite—this should be quick. Please let me know your estimated turnaround and any access details you’ll require.